Access & Alerts on OGLAS — Off-Grid Local Alert System

Door / Gate

Mon, 01 Jan 0001 00:00:00 +0000

The OGLAS door / gate node knows two things: when something is open, and how to open it on command. A paddock gate, a shed door, a depot roller door — same node, same wireless link as the rest of your sensors.

What it does

Detects open/closed state — a reed or limit switch on the frame trips the device, which immediately reports the state change to your hub.
Opens on command — a signal from the hub (or a button in your vehicle) pulses an output that drives your motor or relay. You can open a single door/gate or every one at once.
Reports when it’s done — confirms back to the hub so you know the action ran.

The matching bell can ring a buzzer indoors the moment it trips — works as well on a farm entrance as on a yard gate or a shed left open overnight. See Monitoring and alerts.

Bell

Mon, 01 Jan 0001 00:00:00 +0000

The OGLAS bell is the noise-maker. It sits in the house, the office, the shed — wherever you want to hear about things — and turns sensor activity into sound.

What it does

There are three ways the bell rings:

Pattern match on incoming sensor activity — by default, when the gate opens, the bell triggers a single buzz. Rate-limited so a flaky link can’t replay the same event into a buzz-storm.
Direct ring command — a single, immediate buzz with no cooldown. Use this for manual or scripted pings from the hub.
Alarm mode — a repeating tone for a configurable window (default 60 s). Re-issuing the command extends the window.

Plus remote mute/unmute, and an on-board mute button that toggles silence with a fast-flashing LED to show the bell is alive but quiet.

Electric Fence Active

Mon, 01 Jan 0001 00:00:00 +0000

An electric fence that’s stopped pulsing is just a fence — and animals work that out fast. The OGLAS Electric Fence Active sensor confirms your fence is live, on a schedule you set, and raises the bell the moment it isn’t.

What it does

Detects fence pulses — non-contact pickup (capacitive coupling to the fence wire), no high-voltage wiring into the device.
Reports state periodically — default interval is 5 minutes; configurable.
Reports immediately on state change — fence drops from active to inactive (or comes back), the device fires off a message right away rather than waiting for the next interval. This is the alert that matters.
Tracks pulse rate — a healthy charger has a known cadence. Drift from the expected rate (broken wire shorting to ground, low-battery charger) shows up before the fence dies completely.

Common failure modes it catches

Animal grounding — a sheep tangled in the wire pulls the fence voltage down. Pulses still happen but at much lower amplitude. Worth alerting.
Broken wire — fence is “on” at the charger but doesn’t reach the far end. Catch this by deploying multiple Electric Fence sensors at known points along the line.
Charger fault / dead battery — fence is silent. Most-common failure mode and the one that costs the most.
Vegetation grow-in — gradually loading the fence; the pulse-rate trend will show it before it fails.

Hardware

Battery-powered sensor with a non-contact pickup. The pickup is a small antenna held a few centimetres from the live wire — induced voltage from each fence pulse triggers a counter inside the device. No galvanic connection to the fence, so no risk of energiser pulses entering the electronics.